Tandy 1000 SL Technical Reference Manual page 43

Address
D e s c r i p t i o n
0 0 2 0 8259A I n t e r r u p t C o n t r o l l e r
B i t 4 = 0
C
O p e r a t i o n C o n t r o l Word 3
B i t 3
= 1
B i t 0-1:
B i t
1
B i t
0
-
Read R e g i s t e r Command
0 0 N o A c t i o n
0
1
N o A c t i o n
1 0 Read
I R
R e g i s t e r On N e x t
IOR-
P u l s e
1 1 Read I S R e g i s t e r On N e x t
I O R -
P u l s e
B i t 2
0
N o
P o l l Command
1
P o l l Command
B i t s 5-6
B i t 5 B i t 6
-
S p e c i a l Mask Mode
0
0 N o A c t i o n
0 1
N o A c t i o n
1 0 Reset S p e c i a l Mask
1 1 S e t S p e c i a l Mask
B i t
7 = 0
0 0 2 1 8259A I n t e r r u p t C o n t r o l l e r
I n i t i a l i z a t i o n C o n t r o l Word 2
B i t s 0-7: N o t Used
B i t s 3-7: T3-T7
of I n t e r r u p t Vector A d d r e s s
( 8 0 8 6 / 8 0 8 8 / 8 0 2 8 6 Mode)
I n i t i a l i z a t i o n C o n t r o l Word 3
(Master D e v i c e )
B i t s
0-7 1 I n d i c a t e d I R I n p u t H a s
a
S l a v e
0 I n d i c a t e d I R I n p u t
Does
N o t Have
a
S
1 a v e
32